The world is full of dumb dumbs, and they are the reason that signs like these exist. 

1. Survival of the fittest is never going to work if we keep making sings like this. 

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Source: blazepress

2. The fact that this sign exist means that gas nozzles in butts has happened more than once. 

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Source: ultimatetop10s

3. Just in case you were unaware that fire is a heat source. 

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Source: fugly

4. Yes, the surface of the Earth isn't entirely flat. 

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Source: weboffunny

5. Sand in a desert?! Mind blown. 

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Source: acidcow

6. What possible tortilla crime could have happened to bring about such harsh restrictions?

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Source: chilloutpoint